R version 2.9.0 (2009-04-17)
Copyright (C) 2009 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

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> x <- c(0.9383,0.9217,0.9095,0.8920,0.8742,0.8607,0.8607,0.9005,0.9111,0.9059,0.8883,0.8924,0.8833,0.8700,0.8758,0.8858,0.9170,0.9554,0.9922,0.9778,0.9808,0.9811,1.0014,1.0183,1.0622,1.0773,1.0807,1.0848,1.1582,1.1663,1.1372,1.1139,1.1222,1.1692,1.1702,1.2286,1.2613,1.2646,1.2262,1.1985,1.2007,1.2138,1.2266,1.2176,1.2218,1.2490,1.2991,1.3408,1.3119,1.3014,1.3201,1.2938,1.2694,1.2165,1.2037,1.2292,1.2256,1.2015,1.1786,1.1856,1.2103,1.1938,1.2020,1.2271,1.2770,1.2650,1.2684,1.2811,1.2727,1.2611,1.2881,1.3213,1.2999,1.3074,1.3242,1.3516,1.3511,1.3419,1.3716,1.3622,1.3896,1.4227,1.4684,1.4570,1.4718,1.4748,1.5527,1.5751,1.5557,1.5553,1.5770,1.4975,1.4370,1.3322,1.2732,1.3449,1.3239,1.2785,1.3050,1.3190,1.3650,1.4016,1.4088,1.4268,1.4562,1.4816,1.4914,1.4614,1.4272)
> par3 = 'wisselkoers euro/USD, maandelijks tussen jan'01 en jan'10'
Error: unexpected numeric constant in "par3 = 'wisselkoers euro/USD, maandelijks tussen jan'01"
Execution halted